outletsetr.blogg.se - Regex postgresql query

The output contains the ‘#eduCBA’ and ‘# PostgreSQL’ string, which means matching strings with regular expressions defined in a pattern. We can extract substrings from the above text using the PostgreSQL REGEXP_MATCHES() function as follows, which returns all strings containing hashtags in the given string.Ĭode: SELECT REGEXP_MATCHES('#EduCBA is best learning platform for #PostgreSQL', '#(+)', 'g') ‘#EduCBA is the best learning platform for #PostgreSQL.’

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If the output of the PostgreSQL REGEXP_MATCHES() function is a single element still, it returns a text set.

The flags parameter changes the REGEXP_MATCHES() function’s behaviour. The flag parameter contains zero or more characters.

The REGEXP_MATCHES() function has a flags parameter, which is optional.

It returns a text array of single-element, which contains the substring that matches the pattern specified if the regular expression pattern is without the sub-expressions containing parenthesis.

It returns no rows if the regular expression pattern does not match with the input string.How does PostgreSQL REGEXP_MATCHES() Function work? This can have the value of one or more characters. flags: This flag controls the behaviour of the REGEXP_MATCHES() function.pattern: This defines the POSIX regular expression to match the string.

input_string: This defines the input string from which we want to extract all matched substrings for a specified pattern, a POSIX regular expression.